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Article: Mechanical properties and microstructures of hypergolic and calcined coal gangue based geopolymer recycled concrete

TitleMechanical properties and microstructures of hypergolic and calcined coal gangue based geopolymer recycled concrete
Authors
KeywordsCoal gangue
Geopolymer
Recycled aggregate
Mechanical property
Microstructure
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat
Citation
Construction and Building Materials, 2019, v. 221, p. 691-708 How to Cite?
AbstractThe geopolymer recycled concrete specimens were produced by using hypergolic or calcined coal gangue, slag, fly ash and recycled aggregate as the raw materials. Five different ratios of recycled coarse aggregate to total coarse aggregate and two types of geopolymer recycled concrete schemes (hypergolic coal gangue and calcined coal gangue respectively) were designed for specimen preparation. The compressive strength and splitting tensile strength of the specimens were studied, and the microstructure of the specimens was analyzed by scanning electron microscopy. It is demonstrated by the mechanical property test that the compressive and splitting tensile strength first drop and then grow with the increased mixing ratio of recycled coarse aggregate when the turning point occurs at the mixing ratio of about 30–50%. The microstructure analysis shows that the key factors affecting the mechanical properties of the recycled concrete include the internal porous structure, micro-cracks and the interface bonding ability between geopolymer and recycled coarse aggregate.
Persistent Identifierhttp://hdl.handle.net/10722/274894
ISSN
2019 Impact Factor: 4.419
2015 SCImago Journal Rankings: 1.606
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, C-
dc.contributor.authorDeng, X-
dc.contributor.authorLiu, J-
dc.contributor.authorHui, D-
dc.date.accessioned2019-09-10T02:31:05Z-
dc.date.available2019-09-10T02:31:05Z-
dc.date.issued2019-
dc.identifier.citationConstruction and Building Materials, 2019, v. 221, p. 691-708-
dc.identifier.issn0950-0618-
dc.identifier.urihttp://hdl.handle.net/10722/274894-
dc.description.abstractThe geopolymer recycled concrete specimens were produced by using hypergolic or calcined coal gangue, slag, fly ash and recycled aggregate as the raw materials. Five different ratios of recycled coarse aggregate to total coarse aggregate and two types of geopolymer recycled concrete schemes (hypergolic coal gangue and calcined coal gangue respectively) were designed for specimen preparation. The compressive strength and splitting tensile strength of the specimens were studied, and the microstructure of the specimens was analyzed by scanning electron microscopy. It is demonstrated by the mechanical property test that the compressive and splitting tensile strength first drop and then grow with the increased mixing ratio of recycled coarse aggregate when the turning point occurs at the mixing ratio of about 30–50%. The microstructure analysis shows that the key factors affecting the mechanical properties of the recycled concrete include the internal porous structure, micro-cracks and the interface bonding ability between geopolymer and recycled coarse aggregate.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat-
dc.relation.ispartofConstruction and Building Materials-
dc.subjectCoal gangue-
dc.subjectGeopolymer-
dc.subjectRecycled aggregate-
dc.subjectMechanical property-
dc.subjectMicrostructure-
dc.titleMechanical properties and microstructures of hypergolic and calcined coal gangue based geopolymer recycled concrete-
dc.typeArticle-
dc.identifier.emailDeng, X: xwdeng@hku.hk-
dc.identifier.authorityDeng, X=rp02223-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.conbuildmat.2019.06.048-
dc.identifier.scopuseid_2-s2.0-85067444916-
dc.identifier.hkuros304741-
dc.identifier.volume221-
dc.identifier.spage691-
dc.identifier.epage708-
dc.identifier.isiWOS:000482245000063-
dc.publisher.placeNetherlands-

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